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The result of two years of R&D conducted by a team of the most qualified experts in fitness,P90X includes training so cutting edge, so outrageously effective, you'll be blown away by your visible results and your performance. While wholesale P90X workout is based on Muscle ConfusionTM-to break normal 30-day training plateaus so you get results fast-P90X2 ups the ante with a training technique developed by professional sports trainers for world class results: P.A.P., or Post-Activation Potentiation.